Everard E. Blanciiard : Aphid notes 



209 



Hab. On Sonchus l'rom Lavallol (prov. Buenos Aires), G. R. Hlido- 

 bro col., and l'rom Flores (prov. Buenos Aires), J. M. Bosq col. 



Obs. The young oí lliis species are distinctly carinated. Altho trie re- 

 lative meausurement ol* the antennae of the aplerous virgogenes do not 

 agree with those given by Del Güercio, in Hedía, vol. i4, p. no, 

 they do agree with those given by Van der Goot for Rhopalosiphiun ri- 

 bis, L. which according to Theobald and others is synonymus with 

 Aphis lactucae, Ivalt. lt will be prudent therefore to place the argén tine 

 species under this last ñame, pending further research. 



Genus CAPITOPHORUS V. d, Goot 

 Capitophorus tetrarhodus (Walker) (fig. 12) 



Aplerous virgogene. 



Color : Light-green, to whitish green, at times with spots oí 

 darker green. Eyes dark red. Antennae colorless with dusky tip. 



Y^r-- 



Fig. 12. — Capitophorus tetrarhodus (Walker). Apterous virgogene : 

 a, antenna ; b, segment III of antenna ; c, cornicle ; c, cornicle ; 

 d, cauda. Álate virgogene : e, cornicle; /, cauda; g, antenna; h, 

 segment III of antenna. 



Cornicles, cauda, anal and genital plates, and legs concolorous 

 with body. Tarsi and apex of rostrum darkened. 



Morphological chavacters : Broadly oval, provided with many 

 stout capitate hairs that arise from prominent large cónica! tuber- 

 cles. Yenter provided with a few rather inconspicuous hairs which 



